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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '471d235eda05bd71da7c9b7c571eaa4eeeb6e35386608b49622456a603ff145a' 
  AND token = 'li2C4lm7KH58WvlwUPcru0YDcXfljR9gR8Bps0WfdJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}